Climate Extremes and the Length of Gestation

Dadvand, Payam; Basagaña, Xavier; Sartini, Claudio; Figueras, F.; Vrijheid, Martine; Nazelle, Audrey de; Sunyer, Jordi; Nieuwenhuijsen, Mark

doi:10.1289/ehp.1003241

Cited by 88 publications

(57 citation statements)

References 48 publications

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“…[13][14][15]22,23,[36][37][38] Our results are consistent to some extent with the findings of most previous studies, which showed that higher ambient temperature, especially extreme hot weather, might shorten the gestational age or result in preterm birth. 13,14,22,23,36,37 A recent study based on a birth cohort in Barcelona defined an extreme heat event when the heat index (HI) exceeded the 90th, 95th, and 99th percentiles of heat indices, and found a small reduction (0.2 day) in the average length of gestation when the HI on the day of delivery exceeded the 95th percentile (HI 95 30.5°C). 22 A survival analysis in Brisbane also found that exposure to high temperatures during the last gestational week was associated with an increase of the risk of preterm birth.…”

Section: Discussionsupporting

confidence: 92%

“…13,14,22,23,36,37 A recent study based on a birth cohort in Barcelona defined an extreme heat event when the heat index (HI) exceeded the 90th, 95th, and 99th percentiles of heat indices, and found a small reduction (0.2 day) in the average length of gestation when the HI on the day of delivery exceeded the 95th percentile (HI 95 30.5°C). 22 A survival analysis in Brisbane also found that exposure to high temperatures during the last gestational week was associated with an increase of the risk of preterm birth. 13 In this study, we identified heatwave as a period in which the daily maximum temperatures exceeded certain percentiles of the temperature distribution for two or more consecutive days.…”

Section: Discussionmentioning

confidence: 99%

“…19 Some previous studies that focused on the association between heatwave and health outcomes such as deaths and emergency hospital admissions showed that even a small change in the definition of heatwave can lead to considerable differences in the risk estimates of heatwave. 20,21 To our knowledge, several studies have examined the associations between high temperature or heat stress and preterm birth, 14,22,23 but none of them have taken the duration of heat events into account. This study investigated the effects of heatwave on preterm birth during the period 2000-2010 in Brisbane, Australia.…”

Section: Introductionmentioning

confidence: 99%

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Maternal exposure to heatwave and preterm birth in Brisbane, Australia

Wang

Williams

Lee

et al. 2013

BJOG

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Objective To quantify the short-term effects of maternal exposure to heatwave on preterm birth.Design An ecological study.Setting A population-based study in Brisbane, Australia.Population All pregnant women who had a spontaneous singleton live birth in Brisbane between November and March in 2000-2010 were studied.Methods Daily data on pregnancy outcomes, meteorological factors, and ambient air pollutants were obtained. The Cox proportional hazards regression model with time-dependent variables was used to examine the short-term impact of heatwave on preterm birth. A series of cut-off temperatures and durations were used to define heatwave. Multivariable analyses were also performed to adjust for socio-economic factors, demographic factors, meteorological factors, and ambient air pollutants.Main outcome measure Spontaneous preterm births.Results The adjusted hazard ratios (HRs) ranged from 1.13 (95% CI 1.03-1.24) to 2.00 (95% CI 1.37-2.91) by using different heatwave definitions, after controlling for demographic, socio-economic, and meteorological factors, and air pollutants.Conclusions Heatwave was significantly associated with preterm birth: the associations were robust to the definitions of heatwave. The threshold temperatures, instead of duration, could be more likely to influence the evaluation of birth-related heatwaves. The findings of this study may have significant public health implications as climate change progresses.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Maternal exposure to heatwave and preterm birth in Brisbane, Australia

Wang

Williams

Lee

et al. 2013

BJOG

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“…Temperature shocks may cause fetal losses and preterm births Dadvand et al, 2011;Strand et al, 2011). Although a number of experimental studies have shown that high temperatures affect reproduction in animals, the evidence for humans comes mostly from observations on seasonal relationships and could be biased by other seasonal factors.…”

Section: IImentioning

confidence: 99%

Maybe Next Month? Temperature Shocks, Climate Change, and Dynamic Adjustments in Birth Rates

2015

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Standard-Nutzungsbedingungen:Die Dokumente auf EconStor dürfen zu eigenen wissenschaftlichen Zwecken und zum Privatgebrauch gespeichert und kopiert werden.Sie dürfen die Dokumente nicht für öffentliche oder kommerzielle Zwecke vervielfältigen, öffentlich ausstellen, öffentlich zugänglich machen, vertreiben oder anderweitig nutzen.Sofern die Verfasser die Dokumente unter Open-Content-Lizenzen (insbesondere CC-Lizenzen) zur Verfügung gestellt haben sollten, gelten abweichend von diesen Nutzungsbedingungen die in der dort genannten Lizenz gewährten Nutzungsrechte. Dynamic adjustments could be a useful strategy for mitigating the costs of acute environmental shocks when timing is not a strictly binding constraint. To investigate whether such adjustments could apply to fertility, we estimate the effects of temperature shocks on birth rates in the United States between 1931 and 2010. Our innovative approach allows for presumably random variation in the distribution of daily temperatures to affect birth rates up to 24 months into the future. We find that additional days above 80 °F cause a large decline in birth rates approximately 8 to 10 months later. The initial decline is followed by a partial rebound in births over the next few months implying that populations can mitigate the fertility cost of temperature shocks by shifting conception month. This dynamic adjustment helps explain the observed decline in birth rates during the spring and subsequent increase during the summer. The lack of a full rebound suggests that increased temperatures due to climate change may reduce population growth rates in the coming century. As an added cost, climate change will shift even more births to the summer months when third trimester exposure to dangerously high temperatures increases. Based on our analysis of historical changes in the temperature-fertility relationship, we conclude air conditioning could be used to substantially offset the fertility costs of climate change. Terms of use: Documents in D I S C U S S I O N P A P E R S E R I EJEL Classification: I12, J13, Q54

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“…Hashizume et al (2009) find that perinatal mortality sharply increases with low temperatures. Dadvand et al (2011) conclude that extreme heat was associated with a reduction in the average gestational age of children, which is associated with perinatal mortality and morbidity. Burgess et al (2011) show that weather extremes appear to increase infant mortality in rural India, but not in urban areas.…”

Section: The Physiology Channelmentioning

confidence: 87%

Weather and Welfare: Health and Agricultural Impacts of Climate Extremes, Evidence from Mexico

Compeán

2013

SSRN Journal

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Standard-Nutzungsbedingungen:Die Dokumente auf EconStor dürfen zu eigenen wissenschaftlichen Zwecken und zum Privatgebrauch gespeichert und kopiert werden.Sie dürfen die Dokumente nicht für öffentliche oder kommerzielle Zwecke vervielfältigen, öffentlich ausstellen, öffentlich zugänglich machen, vertreiben oder anderweitig nutzen.Sofern die Verfasser die Dokumente unter Open-Content-Lizenzen (insbesondere CC-Lizenzen) zur Verfügung gestellt haben sollten, gelten abweichend von diesen Nutzungsbedingungen die in der dort genannten Lizenz gewährten Nutzungsrechte. The opinions expressed in this publication are those of the authors and do not necessarily reflect the views of the Inter-American Development Bank, its Board of Directors, or the countries they represent. Terms of use: Documents inThe unauthorized commercial use of Bank documents is prohibited and may be punishable under the Bank's policies and/or applicable laws. Copyright ©Inter-American Development Bank. This working paper may be reproduced for any non-commercial purpose. It may also be reproduced in any academic journal indexed by the American Economic Association's EconLit, with previous consent by the Inter-American Development Bank (IDB), provided that the IDB is credited and that the author(s) receive no income from the publication. Using data for all 2,454 municipalities of Mexico for the period 1980-2010, this paper analyzes the relationship between exposure to extreme temperatures and precipitation and death, as well as the relationship between severe weather and agricultural income and crop production in the country. It is found that extreme heat increases mortality, while the health effect of extreme cold is generally trivial. Precipitation extremes seem to affect the agricultural system, but their impact on mortality is ambiguous. More specifically, exchanging one day with a temperature of 16-18 °C for one day with temperatures higher than 30 °C increases the crude mortality rate by 0.15 percentage points, a result robust to several model specifications. It is also found that the extreme heat effect on death is significantly more acute in rural regions, leading to increases of up to 0.2 percentage points vis-à-vis a 0.07-point increase in urban areas. The timing of climate extremes is relevant: if a weather shock takes place during the agricultural growing season, the effects on mortality and agricultural output, productivity, prices, and crop yields are large and significant, but not so if such shocks occur during the non-growing season. Cataloging-in-PublicationJEL classifications: I12, Q12, Q51, Q54

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Climate Extremes and the Length of Gestation

Cited by 88 publications

References 48 publications

Maternal exposure to heatwave and preterm birth in Brisbane, Australia

Maternal exposure to heatwave and preterm birth in Brisbane, Australia

Maybe Next Month? Temperature Shocks, Climate Change, and Dynamic Adjustments in Birth Rates

Weather and Welfare: Health and Agricultural Impacts of Climate Extremes, Evidence from Mexico

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